/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.commons.service;

import org.apache.iotdb.commons.conf.IoTDBConstant;
import org.apache.iotdb.commons.exception.StartupException;
import org.apache.iotdb.commons.utils.JVMCommonUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.List;

public class StartupChecks {

    private static final Logger logger = LoggerFactory.getLogger(StartupChecks.class);
    public static final StartupCheck checkJDK =
            () -> {
                int version = JVMCommonUtils.getJdkVersion();
                if (version < IoTDBConstant.MIN_SUPPORTED_JDK_VERSION) {
                    throw new StartupException(
                            String.format(
                                    "Requires JDK version >= %d, current version is %d.",
                                    IoTDBConstant.MIN_SUPPORTED_JDK_VERSION, version));
                } else {
                    logger.info("JDK version is {}.", version);
                }
            };
    private final List<StartupCheck> preChecks = new ArrayList<>();
    private final List<StartupCheck> defaultTests = new ArrayList<>();

    public StartupChecks(String nodeRole) {
        defaultTests.add(() -> checkJMXPort(nodeRole));
        defaultTests.add(checkJDK);
    }

    private void checkJMXPort(String nodeRole) {
        Boolean jmxLocal = Boolean.valueOf(System.getProperty(IoTDBConstant.IOTDB_JMX_LOCAL));
        String jmxPort = System.getProperty(IoTDBConstant.IOTDB_JMX_PORT);

        if (jmxLocal) {
            logger.info("Start JMX locally.");
            return;
        }

        if (jmxPort == null) {
            String filename =
                    nodeRole.equals(IoTDBConstant.DN_ROLE)
                            ? IoTDBConstant.DN_ENV_FILE_NAME
                            : IoTDBConstant.CN_ENV_FILE_NAME;
            logger.warn(
                    "{} missing from {}.sh(Unix or OS X, if you use Windows," + " check conf/{}.bat)",
                    IoTDBConstant.IOTDB_JMX_PORT,
                    filename,
                    filename);
        } else {
            logger.info(
                    "Start JMX remotely: JMX is enabled to receive remote connection on port {}", jmxPort);
        }
    }

    public StartupChecks withDefaultTest() {
        preChecks.addAll(defaultTests);
        return this;
    }

    /**
     * execute every pretests.
     */
    public void verify() throws StartupException {
        for (StartupCheck check : preChecks) {
            check.execute();
        }
    }
}
